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Risk-weighted asset (also referred to as RWA) is a bank's assets or off-balance-sheet exposures, weighted according to risk. [1] This sort of asset calculation is used in determining the capital requirement or Capital Adequacy Ratio (CAR) for a financial institution.
Estimate the risk parameters—probability of default (PD), loss given default (LGD), exposure at default (EAD), maturity (M)—that are inputs to risk-weight functions designed for each asset class to arrive at the total risk weighted assets (RWA) The regulatory capital for credit risk is then calculated as 8% of the total RWA under Basel II.
A part of the regulatory Capital and RWA (risk-weighted asset) calculation [1] introduced under Basel 3; The CVA desk of an investment bank, whose purpose is to: hedge for possible losses due to counterparty default; hedge to reduce the amount of capital required under the CVA calculation of Basel 3; The "CVA charge".
There are some options in weighing risks for some claims, below are the summary as it might be likely to be implemented. NOTE: For some "unrated" risk weights, banks are encouraged to use their own internal-ratings system based on Foundation IRB and Advanced IRB in Internal-Ratings Based approach with a set of formulae provided by the Basel-II accord.
Under A-IRB banks are supposed to use their own quantitative models to estimate PD (probability of default), EAD (exposure at default), LGD (loss given default) and other parameters required for calculating the RWA (risk-weighted asset). Then total required capital is calculated as a fixed percentage of the estimated RWA.
For retail exposures banks are required to use their own estimates of the IRB parameters (PD, LGD, CCF). Then total required capital is calculated as a fixed percentage of the estimated RWA. Reforms to the internal ratings-based approach to credit risk are due to be introduced under the Basel III: Finalising post-crisis reforms.
The Tier 1 capital ratio is the ratio of a bank's core equity capital to its total risk-weighted assets (RWA). Risk-weighted assets are the total of all assets held by the bank weighted by credit risk according to a formula determined by the Regulator (usually the country's central bank).
Capital adequacy ratio is the ratio which determines the bank's capacity to meet the time liabilities and other risks such as credit risk, operational risk etc. In the most simple formulation, a bank's capital is the "cushion" for potential losses, and protects the bank's depositors and other lenders.